Incandescent mantle.



PATENTED SEPT. 6, 1904.

M. OFFENBERG. INCANDBSCENT MANTLE.

APPLICATION FILED SEPT. 22, 1902.

N0 MODEL.

' Patented September 6, 1904'.

UNITED STATES ATENT OFFICE..

MOSES OEFENBERG, OF BERLIN, GERMANY.

INCANDESCENT MANTLE.

SPECIFICATION forming' part of Letters Patent No. 769,449, dated September 6, 1904.

Application filed September 22, 1902. Serial No. 124,466. (No model.)

To cir/ZZ whom, t may concern.-

Be it known that l, Moses OiFENnuiiG, a subject of the King' of Prussia, German Eniperoi, and a resident of 3 Luclniuerstrasse, Berlin, Kingdom of Prussia, (erm an Empire, have invented certain new and useful linprovenients in Incandescent hlantles, of which the following is an exact specification.

Mfy invention relates to improvements in incandescent mantles; and it consists in the arrangement of a great number of small threads or loops at the surface of the webbing'.

The mantle is preferably made in the following' manner, though l do not restrict myself to the method herein shown: A webbing is woven of the shape and form of the ordinary mantle, (marked u in the drawings.) In this are interwoven loops which while firmly fastened to the fabric uy do not assist in supporting the skeleton of the mantle, but hang downwardly and outwardly from the webbing u. The purpose of these loops is not to form an additional skeleton for the mantle, but only to provide increased illuminatingsurface for the mantle. These loops are preferably inserted transversely in the fabric of the webbing uy and at the points where the links of the webbing' are joined, there being a series of loops from each vertical series of links in the webbing'.

Itis found that the ordinary mantle by continued use contracts of its own weight after alternate heating and' cooling, and this is one of the principal reasons of the constantly-diminishing illuminating' power of the ordinary mantle. ln my mantle this tendency is countei'acted by-the loops 7), which having no weight to support do not contractin use, andtherefore anford a constant illuminatiiig-surface during the whole life of the mantle. The effect of this arrangement of loops is practically to give a double skeleton to the mantle, one forming the inner frame and supporting the second, consisting of the interwoven loops or threads By cutting of the projecting ends of the loops .7/ as shown in Fig. 6 of the drawings a still greater illuminating-surface is obtained for my mantle. These loops must be cut before the webbing is impregnated with the incandescent salts, and the rougliened threads afford a greatlyenlarged illnininating-surface in the finished mantle.

i\ly invention is shown in the accompanying drawings, in which-- Figure l is a view of a mantle, showing tlircad-loops arranged in regular distances from one another and projecting over the surface of the webbing. Fig. 2 isa verticalsection of the mantle shown in Eig'. l. Figs. 3 and l are views of the webbiiig in an enlarged scale. Fig. 5 is a vertical section of the webbmg'. Fig. f5 is a modification of the webbing, showing the projecting loops cut so as to form small threads.

ln the drawings, a is a gi'ound-webbing of the mantle, and /i are the loops or threads projecting over the saine. By the arrangement of the threads or loops a much better effect of the mantle will be obtained, as the incandescent surface is enlarged without a greater quantity of gas being necessary. In case the projecting loops are cut so as to form projecting threads, as shown in Fig. 6, it has proved advantageous to cut the threads in that way that the cutting-surface is not flat, but that the fibers of the thread are somewhat loose at the ends.

It has already been tried to attain a better effect iii incandescent mantles by arranging' loose rings inthe meshes of the webbing; but these rings are very soon torn off by the pressure of the gas, thereby destroying the incandescent surface of the mantle.

Having' thus fully described the nature 0f my said invention, what l desire to secure by Letters Patent of the United States isl. ln an incandescent-mantle frame, the combination of a ground-webbing', loops inseited therein and outwardly extending from said webbing, said loops being out so as to l In testimony whereofhave signed my name leave projecting threads depending from said to this specification in the presence of two su-b- I0 webbing. soiibing witnesses.

2. In an incandescent-mantle frame, the 5 combination of a webbing and of threads sup- MOSES OFFENBERG ported by and with their ends outwardly eX- Witnesses: tending from said webbing, substantially as HENRY HASPER,

described and for the purpose set forth. WOLDEMAR HAUPT. 

